The Japanese architect Shigeru Ban, whose most revolutionary perform has been directed toward temporary housing for disaster victims, will be leaving a permanent mark on a landmark New York City building. The 132-year-old Cast Iron Home, a downtown Manhattan constructing with a breathtakingly ornate cast iron facade, will soon have a pair of decadently expansive penthouses designed by Ban sitting atop the original 6-story structure—an addition so impressive and visually harmonious that New York’s famously finicky Landmarks Preservation Commission approved the design and style instantly. Living in a Ban space has it’s value, even though: the penthouses, generously infused with the architect’s bespoke white lacquer interior details, are set to go on the marketplace this spring for a clean $12-15 million.